scholarly journals An ultra-compact multiplexed holographic microscope using a multiple-pinhole aperture

2015 ◽  
Vol 23 (20) ◽  
pp. 26779 ◽  
Author(s):  
Yujie Lu ◽  
Yunhui Liu ◽  
Xiao Tian ◽  
Yili Fu ◽  
Jie Zhao
Keyword(s):  
Pinhole Aperture

Potential Acuity Meter Using a Minute Aerial Pinhole Aperture

Ophthalmology ◽  
1983 ◽  
Vol 90 (11) ◽  
pp. 1360-1368 ◽  
Author(s):  
John S. Minkowski ◽  
Millie Palese ◽  
David L. Guyton
Keyword(s):  
Pinhole Aperture

G503 Evaluation of 3D-PTV based on digital integral photography using a multi-pinhole aperture

2009 ◽  
Vol 2009 (0) ◽  
pp. 579-580
Author(s):  
Kenta MORINO ◽  
Shigeru MURATA ◽  
Yohsuke TANAKA
Keyword(s):  
Pinhole Aperture

scholarly journals Integrated Circuit Angular Displacement Sensor with On-chip Pinhole Aperture

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1794
Author(s):  
Udumbara Wijesinghe ◽  
Akash Neel Dey ◽  
Andrew Marshall ◽  
William Krenik ◽  
Can Duan ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Light Emitting Diode ◽  
Angular Displacement ◽  
Angular Position ◽  
Ease Of Use ◽  
Light Spot ◽  
Displacement Sensor ◽  
Wide Range ◽  
Pinhole Aperture ◽  
Physics Model

Sensors that remotely track the displacement of a moving object have a wide range of applications from robotic control to motion capture. In this paper, we introduce a simple, small silicon integrated circuit sensor that tracks the angular displacement of an object tagged with a small light source, such as a light-emitting diode (LED). This sensor uses a new angular transduction mechanism, differential diffusion of photoelectrons generated from the light spot cast by the light tag onto a Si anode, that is described by a simple physics model using pinhole optics and carrier diffusion. Because the light spot is formed by a pinhole aperture integrated on the sensor chip, no external focusing optics are needed, reducing system complexity, size, and weight. Prototype sensors based on this model were fabricated and their basic characteristics are presented. These sensors transduce angular displacement of an LED across orthogonal latitudinal and longitudinal arcs into normalized differential photocathode currents with signal linearly proportional to LED angular position across a ± 40° field-of-view. These sensors offer potential performance and ease-of-use benefits compared to existing displacement sensor technologies.

Effect of X-ray wavelength, pinhole aperture and magnification on spatial resolution

2014 ◽  
Vol 26 (2) ◽  
pp. 22001 ◽  
Author(s):  
袁永腾 Yuan Yongteng ◽  
侯立飞 Hou Lifei ◽  
涂绍勇 Tu Shaoyong ◽  
曹柱荣 Cao Zhurong ◽  
詹夏宇 Zhan Xiayu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
X Ray ◽  
Pinhole Aperture

Thermal lens spectrometry

1990 ◽  
Vol 333 (1628) ◽  
pp. 165-166
Keyword(s):  
Refractive Index ◽  
Thermal Lens ◽  
Radiative Decay ◽  
Local Heating ◽  
Refractive Index Change ◽  
Spectrophotometric Analysis ◽  
Thermal Lens Spectrometry ◽  
Interaction Volume ◽  
Beam Sample ◽  
Pinhole Aperture

Thermal lens spectrometry is a laser-based technique that can be used for extremely sensitive spectrophotometric analysis in nanolitre volumes of solutions. In thermal lens spectrometry (Jun Shen & Snook 1989 a) a laser is used to excite chromophores in solution. Non-radiative decay routes of the excited chromophore leads to local heating of the solvent which in turn leads to a refractive index change in the beam/sample interaction volume. For most solvents the change in refractive index with temperature is negative (— d n /d T )which causes the solution to behave as a diverging lens. For a gaussian beam profile this causes a reduction in beam intensity at the beam centre which can be monitored in the far field of the thermal lens using a pinhole aperture and photomultiplier detector.

Slim near-eye display using pinhole aperture arrays

2015 ◽  
Vol 54 (11) ◽  
pp. 3422 ◽  
Author(s):  
Kaan Akşit ◽  
Jan Kautz ◽  
David Luebke
Keyword(s):  
Pinhole Aperture ◽  
Aperture Arrays
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